Brush-lifting device for dynamo-electric machines.



'G. H. KRAUSKOPF. BRUSH LIFTING DEVICE FOR DYNAMO ELECTRIC MACHINES.

APPLICATION TIL-ED JUNE 21, 1912. 1 Q89 1 37 Patented Mar. 3, 1914.

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jj-Lyf Z WITNESSES:

3'4 INVENTVOZ76Z AT TORNEY G. H. KRAUSKOPP. BRUSH LIFTING DEVICE FOR DYNAMO ELECTRIC MACHINES. APPLIOATION FILED JUNE 21, 1912.

-1,089,1 37. Patented Mar. 3, 1914.

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IN ENTOR UNITED STATES PATENT OFFICE.

GEORGE H. KRAUSKOPIE, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO WESTING- HOUSE ELECTRIC AND MANUFACTURING COMPANY. A CORPORATION OF PENN- SYLVANIA.

Specification of Letters Patent.

Patented Mar; 3, 1914.

Application and June 21, 1912. Serial No. 705,054.

To all whom it may concern:

Be it known that I, GEORGE H. KRAUS- norr, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Brush Lifting Devices for Dynamo-Elecporarily raising the brushes out of engagement with the commutator, cylinders thereof.

The object of my invention is to provide a simple and effective brush-lifting device which will not require manual adjustment to compensate for the wear of the brushes, and which, therefore, will require little or no attention while in use.

My invention is illustrated in the accompanying drawings, Figure 1 of which is an ,end View of a part of a machine constructed in accordance therewith. Fig. 2 is a side and sectional View of a part of the said machine showing substantially the same features" as Fig. 1, and Fig. 3 is an enlarged side view of some of the parts that coiiperate with the brush'to raise it.

The invention is here shown as employed in connection with a rotary converter having a field frame 1 provided with main and auxiliary polar projections 2 and 3, respectively, and with a recess or seat in its end face for the reception of a two-part roclier ring 4. The rocker ring serves as a support for a plurality of regularly spaced laterally and radially extending brackets 5, that are secured thereto but are insulated therefrom,

each of said brackets comprising a bar 6 that extends parallel to, and is spaced a suitable distance from the commutator cylinder 7 of the machine. Each of the bars 6 car-- rie's a plurality of side by side brush holders 8 that are rigidly secured thereto and comprise guides for brushes 9 that bear upon, and are resiliently maintained in engagement with, the commutator cylinder by means of springs 10.

The inner circumferential face of the rocker ring dis provided with a recess for rocker ring and. has a slot and pin connec-; tion with the inner ring 12. The ring 12 carries a plurality of regularly spaced arms or brackets 14: respectively adjacent to the brush holder supports, the said brackets bemg suitably insulated from the ring Each of the brackets 14 is provided at itsinner end with an adjustable clamp for a radially extending rod 15, that is provided at its free end with a slot and a pin 16 extending across the slot. The said pin is embraced by the bifurcated end of an arm 17 that is rigidly attached at its other end to a rod 18 that extends parallel to the brush holder supporting bar 6 and is rotatably mounted in small brackets 19 carried thereby.

Mounted upon the rod 18 at regular intervals are a plurality of substantially U- shaped pawls 20, the ends of one leg of each of which project toward-and are adjacent to the respective brushes the said pawls being carried by pins 11 that pass through and are movable in the rod 18, and are surrounded by short helical springs 22 for normally i'naintaining the pawls in the position shown. The pawls are adapted to engage the teeth of ratchets 23 that are respectively secured to the outer ends of the brushes and extend substantially radially outward therefrom.

In order to raise the brushes out of engagement with thecominutator cylinder, the operating lever 13 is rotated in a countercloclrwisedirection, resulting. in a clockwise rotation of the inner ring .12 and of the radially extending rods 15, the new position of one of the radially extendingrods being shown in broken lines in Fig. 1. The rods 15 in. turn cause rotation of the bifurcated arms. 17 and rotation of the'pawls 20, which are thus brought into engagement with the teeth of the ratchets, with the result that the brushes are moved outwardly and out of en gagement with the .commutator cylinder. \Vhen the machine has attained synchronous speed, the operating lever is again moved to the posit-ion lshown, whereupon the pawls will become disengaged from the ratchets, and the brushes will be returned into engagement with the commutator cylinder by means of the springs 10. The ratchets upon the brushes are of such length that they will always be engaged by the pawls until the brushes are worn to such a degree as to be no longer serviceable, and

since there is no rigid connection between the brush and the lifting means therefor, no manual adjustment of the device is required to compensate for the wear of the brushes. The device, therefore, requires little or no attention while in use and is entirely self adjusting I claim my invention:

1. In a dynamo-electric machine, the comried thereby, and a brush mounted in the holder of a ratchet carried b the brush a a 1 J a pawl adapted to engage therewith, a pawlcarrvirn rod and means for actuatin the l/ o 9 b rod to cause the pawl to engage the ratchet and raise the brush.

3. In a dynamo-electric machine, the combination with a support, a brush holder carried thereby, and a brusn mounted in the holder, of a ratchet carried by the brush, a pawl adapted to engage therewith, a pawl.- carrying rod rotatably mounted upon the support, and means for rotating the rod to cause the pawl to engage the ratchet and raise the brush.

t. A brush-lifting device for dynai'noelectric machines comprising a brush bolder, a brush mounted therein, a ratchet carried by the brush, pawl adapted to engage the ratchet, and means for actuating the pawl to cause it to engage the ratchet and raise the brush.

5. A, brush-lifting device for dynamoelectric machines comprising a brush holder, a brush mounted therein, a pawl, a ratchet and means for causing the pawl to engage the ratchet and thereby move the brush in the holder.

6. A brush-lifting device for dynamoelectric machines comprising a brush holder, a brush mounted therein, a pawl and a ratchet one of which is carried by the brush, and means for actuating the other of said parts. 7

7. In a dynamo-electric machine, the com bination with a support, a brush holder carried thereby, and a brush mounted in the holder, of a ratchet carried by the brush, a pawl adapted to engage therewith, a pawlearrying rod rotatably mounted upon the support, a ring that is rotatable with respect to the support, and means carried thereby for actuating the pawl carrying rod.

8. In a dynamo-electric machine, the combination with a brush holder, a brush n'iountcd in the holder, and a support for the holder, of pawl and ratchet mechanism tor moving the brush in the holder,-and a member that carries a part of said mechanism and is interposed between the brush holder and its support.

9. In a dynamo-electric machine, the combination with. a brush holder, :1 brush mounted in the holder, and a support for the holder, of mechanism for moving the brush in the holder, and a member that carries a part mt said mechanism and is interposed betwe i the brush holder and its support. I

10. In a dynamo-electric machine, the combination with a brush holder, and a brush mounted in the holder, of pawl and ratchet mechanism for moving the brush in the holder.

In testimony whereof, I have hereunto subscribed my name this 20th day of June,

GEORGE H. KRAUSKOPF. Witnesses:

EMMA KRAUSKOPF, B. B. I-Iin'ns' Copies of this patent may be obtained for we cents each, by addressing-the Commissioner of Patents.

Washington, D. 0., l 

